Process for producing a soluble aromatic coffee extract



Patented June 13, 1950 UNITED STATES PATENT OFFICE AROMATIC COFFEE EXTRA Tibor Holzer, Zurich, Switzerland, llllllifll to E. Oswald, Zurich, Switzerland No Drawing. Application September 11, 1947, Serial No. 773,519. In Switzerland April 23, 1948 Section 1, Public Law 690, August 8, i946 Patent expires April 23, 1966 1 Claim.

It is known in the art to subject coffee, roasted or not, to an extraction process by the aid of hot or cold water, and to thus produce, from the solution obtained, a completely soluble cofleeextract through evaporation and atomizing. It thus has been proposed, e. g., to extract raw coffee, and then to roast the raw-coffee extract at 225 C. All such extracts, however, have the disadvantages that the so-called cofiee-aroma partly gets lost in the course 01' the technical operations which have to be performed with the extract solution, and that the beverage made 01 such extracts, therefore, has a fiat taste which reminds one little of coflee.

In accord with my present invention, now, it is proposed to ensure the conservation of this coflee aroma by roasting the green colleebeans-in the presence of at least one carbohydrate which does not produce any caramelizing products which impair the coffee aromaso that only part of the coffee-aroma substances is liberated, whereupon-after lixiviating the roasted product and evaporating the extractthe residue is further aromatized by a further heating.

The coffee may be roasted in the ground or whole state. The final cofiee aroma is fully developed, as has been shown, only when making the cofiee beverage, i. e. when mixing the extract with hot water.

The coffee extract may be made; e. g.. as follows:

100 parts (by weight) of green, ground or whole coffee beans are mixed with 20-30 parts (by weight) of pulverized. glucose and only roasted until part of the coffee aroma is liberated or developed, the carbohydrate being caramelized. The mixture then is quickly cooled and extracted hot, in a closed vessel and in known manner, with 300 parts of water. The solution then is filtered, and such operation repeated twice. The extract solution thus obtained is concentrated, if desired, by deep-cooling and freezing, evaporated in vacuo, and the residue further aromatized by a further heating. The cofl'ee-extract thus obtained may be marketed in powder form or in form of pills and the like.

The product made according to my present process Iumishes a good, aromatic coffee-beverage when mixed with the hot water.

In place of glucose, one also may use dextrose, maltose, or a inixture of one or all of these carbohydrates.

The extract powder also may be mixed with milk powder, pressed into pill form, and, if desired, be sugar-coated.

What I claim and desire to secure by Letters Patent is:

A process for producing a fully soluble aromatic coflee extract in powder form, comprising aroma.

TIBOR. HOLZER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,175,091 Vietinghofl Mar. 14, 1916 1,367,715 Pratt et a1. --Feb. 8. 1921 1,499,780 Oprean July 1, 1924 FOREIGN PATENTS Number Country Date 7,427 Great Britain Feb. 16, 1911 of 1910 

